arch/alpha/kernel/sys_nautilus.c

   1 /*
   2  *      linux/arch/alpha/kernel/sys_nautilus.c
   3  *
   4  *      Copyright (C) 1995 David A Rusling
   5  *      Copyright (C) 1998 Richard Henderson
   6  *      Copyright (C) 1999 Alpha Processor, Inc.,
   7  *              (David Daniel, Stig Telfer, Soohoon Lee)
   8  *
   9  * Code supporting NAUTILUS systems.
  10  *
  11  *
  12  * NAUTILUS has the following I/O features:
  13  *
  14  * a) Driven by AMD 751 aka IRONGATE (northbridge):
  15  *     4 PCI slots
  16  *     1 AGP slot
  17  *
  18  * b) Driven by ALI M1543C (southbridge)
  19  *     2 ISA slots
  20  *     2 IDE connectors
  21  *     1 dual drive capable FDD controller
  22  *     2 serial ports
  23  *     1 ECP/EPP/SP parallel port
  24  *     2 USB ports
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/types.h>
  29 #include <linux/mm.h>
  30 #include <linux/sched.h>
  31 #include <linux/pci.h>
  32 #include <linux/init.h>
  33 #include <linux/reboot.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/bitops.h>
  36
  37 #include <asm/ptrace.h>
  38 #include <asm/system.h>
  39 #include <asm/dma.h>
  40 #include <asm/irq.h>
  41 #include <asm/mmu_context.h>
  42 #include <asm/io.h>
  43 #include <asm/pci.h>
  44 #include <asm/pgtable.h>
  45 #include <asm/core_irongate.h>
  46 #include <asm/hwrpb.h>
  47 #include <asm/tlbflush.h>
  48
  49 #include "proto.h"
  50 #include "err_impl.h"
  51 #include "irq_impl.h"
  52 #include "pci_impl.h"
  53 #include "machvec_impl.h"
  54
  55
  56 static void __init
  57 nautilus_init_irq(void)
  58 {
  59         if (alpha_using_srm) {
  60                 alpha_mv.device_interrupt = srm_device_interrupt;
  61         }
  62
  63         init_i8259a_irqs();
  64         common_init_isa_dma();
  65 }
  66
  67 static int __init
  68 nautilus_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  69 {
  70         /* Preserve the IRQ set up by the console.  */
  71
  72         u8 irq;
  73         /* UP1500: AGP INTA is actually routed to IRQ 5, not IRQ 10 as
  74            console reports. Check the device id of AGP bridge to distinguish
  75            UP1500 from UP1000/1100. Note: 'pin' is 2 due to bridge swizzle. */
  76         if (slot == 1 && pin == 2 &&
  77             dev->bus->self && dev->bus->self->device == 0x700f)
  78                 return 5;
  79         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
  80         return irq;
  81 }
  82
  83 void
  84 nautilus_kill_arch(int mode)
  85 {
  86         struct pci_bus *bus = pci_isa_hose->bus;
  87         u32 pmuport;
  88         int off;
  89
  90         switch (mode) {
  91         case LINUX_REBOOT_CMD_RESTART:
  92                 if (! alpha_using_srm) {
  93                         u8 t8;
  94                         pci_bus_read_config_byte(bus, 0x38, 0x43, &t8);
  95                         pci_bus_write_config_byte(bus, 0x38, 0x43, t8 | 0x80);
  96                         outb(1, 0x92);
  97                         outb(0, 0x92);
  98                         /* NOTREACHED */
  99                 }
 100                 break;
 101
 102         case LINUX_REBOOT_CMD_POWER_OFF:
 103                 /* Assume M1543C */
 104                 off = 0x2000;           /* SLP_TYPE = 0, SLP_EN = 1 */
 105                 pci_bus_read_config_dword(bus, 0x88, 0x10, &pmuport);
 106                 if (!pmuport) {
 107                         /* M1535D/D+ */
 108                         off = 0x3400;   /* SLP_TYPE = 5, SLP_EN = 1 */
 109                         pci_bus_read_config_dword(bus, 0x88, 0xe0, &pmuport);
 110                 }
 111                 pmuport &= 0xfffe;
 112                 outw(0xffff, pmuport);  /* Clear pending events. */
 113                 outw(off, pmuport + 4);
 114                 /* NOTREACHED */
 115                 break;
 116         }
 117 }
 118
 119 /* Perform analysis of a machine check that arrived from the system (NMI) */
 120
 121 static void
 122 naut_sys_machine_check(unsigned long vector, unsigned long la_ptr,
 123                        struct pt_regs *regs)
 124 {
 125         printk("PC %lx RA %lx\n", regs->pc, regs->r26);
 126         irongate_pci_clr_err();
 127 }
 128
 129 /* Machine checks can come from two sources - those on the CPU and those
 130    in the system.  They are analysed separately but all starts here.  */
 131
 132 void
 133 nautilus_machine_check(unsigned long vector, unsigned long la_ptr)
 134 {
 135         char *mchk_class;
 136
 137         /* Now for some analysis.  Machine checks fall into two classes --
 138            those picked up by the system, and those picked up by the CPU.
 139            Add to that the two levels of severity - correctable or not.  */
 140
 141         if (vector == SCB_Q_SYSMCHK
 142             && ((IRONGATE0->dramms & 0x300) == 0x300)) {
 143                 unsigned long nmi_ctl;
 144
 145                 /* Clear ALI NMI */
 146                 nmi_ctl = inb(0x61);
 147                 nmi_ctl |= 0x0c;
 148                 outb(nmi_ctl, 0x61);
 149                 nmi_ctl &= ~0x0c;
 150                 outb(nmi_ctl, 0x61);
 151
 152                 /* Write again clears error bits.  */
 153                 IRONGATE0->stat_cmd = IRONGATE0->stat_cmd & ~0x100;
 154                 mb();
 155                 IRONGATE0->stat_cmd;
 156
 157                 /* Write again clears error bits.  */
 158                 IRONGATE0->dramms = IRONGATE0->dramms;
 159                 mb();
 160                 IRONGATE0->dramms;
 161
 162                 draina();
 163                 wrmces(0x7);
 164                 mb();
 165                 return;
 166         }
 167
 168         if (vector == SCB_Q_SYSERR)
 169                 mchk_class = "Correctable";
 170         else if (vector == SCB_Q_SYSMCHK)
 171                 mchk_class = "Fatal";
 172         else {
 173                 ev6_machine_check(vector, la_ptr);
 174                 return;
 175         }
 176
 177         printk(KERN_CRIT "NAUTILUS Machine check 0x%lx "
 178                          "[%s System Machine Check (NMI)]\n",
 179                vector, mchk_class);
 180
 181         naut_sys_machine_check(vector, la_ptr, get_irq_regs());
 182
 183         /* Tell the PALcode to clear the machine check */
 184         draina();
 185         wrmces(0x7);
 186         mb();
 187 }
 188
 189 extern void free_reserved_mem(void *, void *);
 190 extern void pcibios_claim_one_bus(struct pci_bus *);
 191
 192 static struct resource irongate_mem = {
 193         .name   = "Irongate PCI MEM",
 194         .flags  = IORESOURCE_MEM,
 195 };
 196
 197 void __init
 198 nautilus_init_pci(void)
 199 {
 200         struct pci_controller *hose = hose_head;
 201         struct pci_bus *bus;
 202         struct pci_dev *irongate;
 203         unsigned long bus_align, bus_size, pci_mem;
 204         unsigned long memtop = max_low_pfn << PAGE_SHIFT;
 205
 206         /* Scan our single hose.  */
 207         bus = pci_scan_bus(0, alpha_mv.pci_ops, hose);
 208         hose->bus = bus;
 209         pcibios_claim_one_bus(bus);
 210
 211         irongate = pci_get_bus_and_slot(0, 0);
 212         bus->self = irongate;
 213         bus->resource[1] = &irongate_mem;
 214
 215         pci_bus_size_bridges(bus);
 216
 217         /* IO port range. */
 218         bus->resource[0]->start = 0;
 219         bus->resource[0]->end = 0xffff;
 220
 221         /* Set up PCI memory range - limit is hardwired to 0xffffffff,
 222            base must be at aligned to 16Mb. */
 223         bus_align = bus->resource[1]->start;
 224         bus_size = bus->resource[1]->end + 1 - bus_align;
 225         if (bus_align < 0x1000000UL)
 226                 bus_align = 0x1000000UL;
 227
 228         pci_mem = (0x100000000UL - bus_size) & -bus_align;
 229
 230         bus->resource[1]->start = pci_mem;
 231         bus->resource[1]->end = 0xffffffffUL;
 232         if (request_resource(&iomem_resource, bus->resource[1]) < 0)
 233                 printk(KERN_ERR "Failed to request MEM on hose 0\n");
 234
 235         if (pci_mem < memtop)
 236                 memtop = pci_mem;
 237         if (memtop > alpha_mv.min_mem_address) {
 238                 free_reserved_mem(__va(alpha_mv.min_mem_address),
 239                                   __va(memtop));
 240                 printk("nautilus_init_pci: %ldk freed\n",
 241                         (memtop - alpha_mv.min_mem_address) >> 10);
 242         }
 243
 244         if ((IRONGATE0->dev_vendor >> 16) > 0x7006)     /* Albacore? */
 245                 IRONGATE0->pci_mem = pci_mem;
 246
 247         pci_bus_assign_resources(bus);
 248
 249         /* pci_common_swizzle() relies on bus->self being NULL
 250            for the root bus, so just clear it. */
 251         bus->self = NULL;
 252         pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
 253 }
 254
 255 /*
 256  * The System Vectors
 257  */
 258
 259 struct alpha_machine_vector nautilus_mv __initmv = {
 260         .vector_name            = "Nautilus",
 261         DO_EV6_MMU,
 262         DO_DEFAULT_RTC,
 263         DO_IRONGATE_IO,
 264         .machine_check          = nautilus_machine_check,
 265         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 266         .min_io_address         = DEFAULT_IO_BASE,
 267         .min_mem_address        = IRONGATE_DEFAULT_MEM_BASE,
 268
 269         .nr_irqs                = 16,
 270         .device_interrupt       = isa_device_interrupt,
 271
 272         .init_arch              = irongate_init_arch,
 273         .init_irq               = nautilus_init_irq,
 274         .init_rtc               = common_init_rtc,
 275         .init_pci               = nautilus_init_pci,
 276         .kill_arch              = nautilus_kill_arch,
 277         .pci_map_irq            = nautilus_map_irq,
 278         .pci_swizzle            = common_swizzle,
 279 };
 280 ALIAS_MV(nautilus)